Improvement in angle attachments for dental engines



E. T. STARR.

ANGLE ATTACHMENT FOR DENTAL-ENGINE.

No.175,626. Patented Apr14,18'76.

WITJVESSES INVENTOR k7 2 Eli T'tarr 3.1/ is .Hl-'torney N-PETERS, PHUTULTMQGRAPNER. WASHINGTON, D C.

UNITED STATES ELI T. STARR, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO SAMUELV PATENT OFrIc.,

S. WHITE, OF SAME PLAGE.

IMPROVEMEN'I' IN ANGLE ATTACHMENTS FOR DENTAL ENGINES.

Specication forming part of Letters Patent No. 175,626, dated April 4, 1876; application filed March 22, 1876.

To all 'whom it may concern Be it known that I, ELI T. STARR, of the city and county of Philadelphia, in the State ot' Pennsylvania, have invented certain new and useful Improvements in Angle Attachments for Dental Engines, of which the following is a specication My invention relates to that class of dental tools` known as angle attachments; its object is to provide a simple, efcient, and compact angle attec'hment adapted for application to the hand-piece of a dental engine.

The subject-matter claimed will hereinafter be specified.

In the accompanying drawings, Figure 1 is a plan or top view of my? improved instrument; Fig. 2, a side elevation thereof', and Fig. a longitudinal central section therethrough on the line a; a: otpFig. 1.

The barrel A ot' the attachment is slotted longitudinally, and constitutes a spring to embrace and clasp the hand-piece of a dental engine when slipped overits outer end. A shaft, B, turns in bearings in the barrel A, its rear end or shank being attened, as shown, to adapt it to pass in the chuck or tool-holder of the hand-piece, and interlock with its drivingshaft by suitable connections. A bevel-Wheel, b, on this shaft B gears into a corresponding wheel, c, on a shaft, c', turning in bearings in a nose or angle-piece, U, secured permanently upon the barrel or frame. The barrel and angle-piece abut, so as to form a covering for the gearing The shaft o is provided with a suitable socket I'or the reception of the shank of the tool or operatinginstrument. The anglepiece C is set at an angle or inclination of from ve to ten degrees, relatively, to the axis of the hand-piece, and is well adapted for operating in the mouth.

Angle attachments have heretofore been made with a joint, permitting them to be setV at various angles to the driving-shaft, and iixed angle-pieces have also been employed; but I am not aware ot' the employment in a dentalinstrument of an angle-piece set at an acute angle to the driving-shaft, and having its gearing protected.

The construction above described .renders the instrument very compact at a point where economy of space is especially desirable, owing to the limited space in which itis required to operate. I

I claim- The improved angle attachment for the hand-piece of dental engines, hereinbef'ore described, consisting ofthe combination of the barrel, the driving-shaft mounted therein, the angle-piece, its driving-shaft, and the gearing inclosed by the barrel and angle-piece.

In testimony whereof I have hereunto subscribed my name.

ELI T.` STARR.

Witnesses:

J oHN URIAN, J. A. B. WILLIAMS. 

